The following images of the Identity Matrix are produced using the gpg --list-sigs command processed by the sig2dot script. This raw data is then tuened into a picture using three different programs (click on the links to see the pictures):

springgraph uses straight lines and bunches people who have signed each others keys together.

neato also bunches people who have signed others keys, but uses curved lines.

Since everyone (almost) is signing Bruce's key, I wanted all his signers in my keyring. I found this Ruby script useful. It assumes you have a default keyserver set in your preferences. I guess it's not very robust code. Better ideas welcomed - Barry

The first argument to the script will be the keyid (or email, or whatever gpg understands) to retrieve all unidentified signers for. I use that script as part of a larger system which allows me to do key-signing very easily.